<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>

    // prompt()
    // alert()


    function fn(x, y) {
       console.log('666')
      return x + y
     
    }


    document.write(fn(1, 2))

  </script>
</body>

</html>